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Originally Posted by WillyPete
Unplug everything.
On MB, install CPU, Memory (1 stick only), Graphics card.
Add power to the MB.
Plug in mouse and keyboard and Monitor.
Turn it on and check the bios, particularly the bios health indicator. Usually has temp in there.
Watch it for a bit.
If ok, add HD, same process.
Add CD/DVD. Keep monitoring.
Keep going until you find what breaks it or until it's stable.
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It’s even better to take the motherboard out and place it on the static bag, and tests it there, it sounds like it’s a short, as a component heats up it expands and shorts. Other then that, the heat sink could be losing contact when it is standing up, look at that too.